We have a QSIG PRI connecting a Nortel Option 81C and a CallManager 4.1(3) system. When I call from my IP phone to a Nortel phone that hangs off of the PBX, I hear static in my phone when I talk. It goes away as soon as I stop talking. The person on the Nortel phone doesn't hear any static at all, and they sound clear as a bell to me. The static only happens on my end when I'm talking.
I don't even know where to begin troubleshooting this problem.
This type of issue happens usually due to VAD or if it is not adjusted properly. Cisco usually recommends disabling VAD if fine tuning does not help. Please use the following link to tune or turn off VAD.
This is CCM with MGCP gateways, not CME. We're not using dial peers.
Interestingly, I've discovered that this only happens when I call a certain extension that has appearances on two different phones in the same room. It doesn't not happen when I call other Nortel phones, so it must have something to do with that room. I also hear an quiet electronic hum on one of those phones. There's probably just something weird about those two phones.
I'm not going to worry about this any longer unless the problem starts happening on other phones.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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